Journal of Animal Science, Vol 75, Issue 6 1584-1590, Copyright © 1997 by American Society of Animal Science

JOURNAL ARTICLE

Body composition and protein and fat accretion in various body components in growing gilts fed diets with different protein levels but estimated to contain similar levels of ideal protein

J. K. Tuitoek, L. G. Young, C. F. de Lange and B. J. Kerr
Department of Animal and Poultry Science, University of Guelph, ON, Canada.

A comparative slaughter technique was used to determine the effect of dietary protein levels on body composition and protein and fat accretion in various body components in Yorkshire gilts. Diets were formulated to contain similar levels of idea protein. Eight gilts were slaughtered at 20 kg BW to determine initial body composition. Twenty-four gilts were assigned to each of three dietary treatments (16.6, 15.0 and 13.0% CP) during the growing period (20 to 55 kg BW). During the finishing period (55 to 100 kg BW), dietary CP levels were reduced by approximately two percentage units. Eight gilts per treatment were slaughtered at 55 kg BW, and the remaining pigs were slaughtered at 100 kg BW. At slaughter, the pits were divided into three components: carcass, empty gastrointestinal tract, and other non-carcass parts. Half of the carcass was further dissected into retail cuts. None of the carcass retail cuts was affected (P > .10) by the dietary CP levels, except trimmed ham was smaller (P < .05) in gilts fed the 13% CP growing and 11% CP finishing diets. Far content in the empty body (P = .12) and in the carcass (P = .06) was highest and the empty body water accretion rate was lowest (P = .05) in gilts fed the 13% CP growing and 11% CP finishing diets. Other aspects of chemical body composition, protein and fat accretion rates, and estimated lean yields were not affected by dietary CP level (P > .10).

This article has been cited by other articles:

				K. W. Ssu, M. C. Brumm, and P. S. Miller Effect of feather meal on barrow performance J Anim Sci, September 1, 2004; 82(9): 2588 - 2595. [Abstract] [Full Text] [PDF]

				R. N. Weis, S. H. Birkett, P. C. H. Morel, and C. F. M. de Lange Effects of energy intake and body weight on physical and chemical body composition in growing entire male pigs J Anim Sci, January 1, 2004; 82(1): 109 - 121. [Abstract] [Full Text] [PDF]

				B. J. Kerr, L. L. Southern, T. D. Bidner, K. G. Friesen, and R. A. Easter Influence of dietary protein level, amino acid supplementation, and dietary energy levels on growing-finishing pig performance and carcass composition J Anim Sci, December 1, 2003; 81(12): 3075 - 3087. [Abstract] [Full Text] [PDF]

				B. J. Kerr, J. T. Yen, J. A. Nienaber, and R. A. Easter Influences of dietary protein level, amino acid supplementation and environmental temperature on performance, body composition, organ weights and total heat production of growing pigs J Anim Sci, August 1, 2003; 81(8): 1998 - 2007. [Abstract] [Full Text] [PDF]

				P. A. Lovatto and D. Sauvant Modeling homeorhetic and homeostatic controls of pig growth J Anim Sci, March 1, 2003; 81(3): 683 - 696. [Abstract] [Full Text] [PDF]

				J. L. Figueroa, A. J. Lewis, P. S. Miller, R. L. Fischer, R. S. Gomez, and R. M. Diedrichsen Nitrogen metabolism and growth performance of gilts fed standard corn-soybean meal diets or low-crude protein, amino acid-supplemented diets J Anim Sci, November 1, 2002; 80(11): 2911 - 2919. [Abstract] [Full Text] [PDF]

				C. P. A. Van de Ligt, M. D. Lindemann, and G. L. Cromwell Assessment of chromium tripicolinate supplementation and dietary protein level on growth, carcass, and blood criteria in growing pigs J Anim Sci, September 1, 2002; 80(9): 2412 - 2419. [Abstract] [Full Text] [PDF]